ARM: shmobile: ape6evm-reference: Correct BSC bus range

The address space for the r8a73a4 Bus State Controller covers the first
512 MiB, not the first 2 GiB.
Correct the size in the "ranges" property to reflect this, and to no
longer overlap with PCI Express Memory.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r8a73a4-ape6evm-reference.dts

@@ -67,7 +67,7 @@ lbsc {
 		compatible = "simple-bus";
 		#address-cells = <1>;
 		#size-cells = <1>;
-		ranges = <0 0 0 0x80000000>;
+		ranges = <0 0 0 0x20000000>;
 	};
 };